前后双扑翼水平距离及相位差对其气动性能的影响

通过在动态网格上求解Navier-Stokes方程,对前后双扑翼的非定常粘性流场进行了数值模拟和气动干扰分析,考察了前后翼不同水平距离和不同相位差对其气动力和气动效率的影响。结果表明,扑动前翼和静止后翼间的气动干扰在各种不同水平距离下都有利于气动特性的改善,但气动干扰的作用随着前后翼水平距离的增大而减弱;前后双翼扑动的相位差是影响气动性能的重要参数,两翼间的气动干扰是否有利则与相位差和水平距离有直接联系。

Influence of horizontal distance and phase on aerodynamics of dual flapping airfoils in tandem configurations

The unsteady viscous flow fields around dual flapping airfoils in tandem configurations are simulated by a Navier-Stokes Solver on dynamic deformable hybrid meshes. The variation of aerodynamic forces and power as a function of phase difference and horizontal distance are studied, as well as wing-wing aerodynamics interactions. The results indicate that, when a fore airfoil is flapping with a fixed hind airfoil, the aerodynamic interaction between them is of great benefit to aerodynamic performance at different distances, with weaker effect as distance increasing, howerver. When the fore and hind airfoils are flapping simultaneously, the phase of them has great influence on aerodynamics and whether the interaction benefits aerodynamic performance or not depends on the phase and the horizonal distance.